perf(oiiotool): use pointer not static for internal color config #6242

Job	Run time
windows-2019 VS2019	49m 59s
macos-12 appleclang13/C++17 py3.10 MacOS-12	29m 30s
windows-2022 VS2022	48m 25s
macos-13 appleclang14/C++17 py3.11 MacOS-13	34m 32s
VFX2021 gcc9/C++17 py3.7 exr3.1 ocio2.0	13m 57s
macos-14 appleclang15/C++20 py3.11 MacOS-14-ARM	12m 18s
VFX2021 clang10/C++17 avx2 exr3.1 ocio2.0	13m 30s
VFX2022 gcc9/C++17 py39 exr3.1 ocio2.1	12m 19s
Ubuntu latest releases gcc13 C++20 py3.12 avx2 exr3.2 ocio2.3	19m 16s
VFX2022 clang13/C++17 py39 avx2 exr3.1 ocio2.1	12m 36s
VFX2022 icc/C++17 py3.9 exr3.1 ocio2.1 qt5.15	17m 43s
Ubuntu bleeding edge gcc14 C++20 py3.12 OCIO/libtiff/exr-master avx2	31m 21s
VFX2022 icx/C++17 py3.9 exr3.1 ocio2.2 qt5.15	15m 33s
Ubuntu all local builds gcc12 C++17 avx2 exr3.2 ocio2.3	18m 10s
VFX2024 sanitizers	39m 25s
Ubuntu clang14 C++20 avx2 exr3.1 ocio2.1	13m 41s
Ubuntu debug gcc9/C++17, sse4.2, exr3.1	17m 57s
VFX2023 gcc11/C++17 py3.10 exr3.1 ocio2.2	11m 14s
Ubuntu static libs gcc9 C++17 exr2.4	13m 24s
VFX2024 gcc11/C++17 py3.11 exr3.2 ocio2.3	12m 23s
Ubuntu clang-format	5m 59s
VFX2021 oldest gcc9.3/C++17 py3.7 exr-3.1	16m 25s
VFX2021 hobbled gcc9.3/C++17 py3.7 exr-3.1 no-sse	16m 4s
VFX2023 abi check	12m 14s
	8h 7m 55s

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